From November 1931 to June 1934 was Stabsführer of the Hitler Youth and deputy to ReichsjugendführerBaldur von Schirach. In July 1933, Schirach dissolved the Reich Committee of German Youth Associations which represented 135 different youth groups. Nabersberg led a raid on the Berlin headquarters of the Committee, with a handful of Sturmabteilung men and 50 armed teenagers from the Hitler Youth. (The figure of 50 armed teenagers comes from Baldur von Schirach's 1934 book Die Hitler – Jugend and may be exaggerated. A postwar account by Helene Gehse, one of five staff at the headquarters, reported a very small number of Hitler Youth, one of whom was armed with an old carbine.[2]) During the raid, Hermann Maaß was summoned and threatened by Nabersberg before being told to leave the building.[3] Schirach named Nabersberg as one of the "Pioneers of the Third Reich" in his 1933 book.[4]

From July 1934 he became head of the Border and International Relations Office of the Hitler Youth, promoting ethnic politics amongst Germanic youth in neighbouring countries.[5] In January 1935 he resigned this position for health reasons and assumed the duties of an Obergebietsführer of the Hitler Youth.[6] In November 1937 he met Lord Baden-Powell with a view to forging closer ties between the Hitler Youth and The Scout Association.[7]

After the war, the West Berlin Denazification Tribunal fined Nabersberg ℛℳ6,000.[8] He died in 1946.